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it's an old triple crank, 8mm allen bolt each side
these have just unscrewed and crank is jammed on
are these meant to be self extracting bolts ? if so they haven't worked and just came straight out. I tried a crank extractor but this just screwed straight into the middle of the axle - nothing to push against
Do you have the right size extractor? You can see here at 2:10 there are different ones:
Depending on the size of the hole you may be able to get away with using something like a 5p coin as an adapter to press against.
If you are replacing everything (i.e. both the crank and the bottom bracket) you can just loosen off the bolts a bit and ride it around - the cranks will come loose (but it will probably ruin the crank or spline interface).
ahhh cunning plan with the coin - will try that
If threading the extractor into the crank make sure the puller is done up tight, if you dont theres a likelihood thee puller will rip out taking the crank thread with it, and then you'll be in nightmare land 😉
Same goes for the old style bottom bracket. Look on you tube for tips,as these tend to have a habit of seizing themselves in. And thats a bigger nightmare than stuck cranks.
right - it needed a different extractor, one on which I happened to have. Haven't used a crank extractor for ages!